By-pass valve



Jan. 12, 1932. c MlLLER 1,840,968

BY.- PASS VALVE Filed Oct. 24, 1929 wuento'o Patented Jan. 12, 1932PATENT OFFICE 11; nrLLEn, or PORTLAND, OREGON BY-PASS VALVE Applicationfiled October 24,1929. Serial No. 402,143.

My invention relates to valve controls for hydraulic cylinders and hasfor its primary purpose the regulating of effective pressure that may bedeveloped within a hydraulic 5 cylinder. 7 a

' p The invention consists primarily of a body element having inlet andoutlet passageways leading to and from theginterior of the body elementand having a valve stem disposed between the passage-ways for cuttingoff the pressure and the flow of the fluid un er pressure'between theinlet, and the outlet passageway to thereby regulateithe efiectivepressure developed Within the cylinder;

A further object of my invention is to provide a settable: controlmechanism for actuaungamive stem relatively to a pluralityoff-passageways disposed" between the inlet and outlet passageway forpredetermining the effectivepressure to be developed within thehydraulic cylinder.

Afurther object of my invention consists in providing, in simplifiedform, a hand manipulative pressure regulator for predetermining theamount of eflective pressure that may be developed within a hydrauliccylinder.

\Vith these and incidental objects in view, the invention consists incertain novel features of construction and combination of parts, theessential elements of which are set forth in the appended claims, and apreferred form of embodiment of which is hereinafter shown withreference to the drawings which 5 accompany and form a part of thisspecification.

In the drawings:

Fig. 1 is a side elevation, partially in section of the assembleddevice.

Fig. 2 is a longitudinal, sectional, side elevation of the assembleddevice.

Fig. 3 is a cross section view taken on line 3-3 of Fig. 2 looking inthe direction indicated.

Fig. 4 is a fragmentary, sectional, side view of the mechanismillustrated in Fig. 3, the same being taken on line 44 of Fig. 3 lookingin the direction indicated.

Like reference characters refer to like parts throughout the severalviews.

I preferably form my device of a body element 1, having means associatedwith the body element for removably securing an inlet pipe 2 to the baseand an outlet pipe 3. The inlet and outlet pipes are for the purpose ofconducting the operating fluids through the body element. The inlet pipemay be secured to the base by a sleeve connection 4 or by any othersuitable fastening means. The outlet pipe 3 may be directly threadedinto the flange 5 disposed at the base. The inlet pipe 2 connects thebody element with a hydraulic cylinder, not here shown, and thedischarge pipe 8 leads to a sump or to any other discharge receivingstation. A valve stem 6 is reciprocably disposed longitudinally of thebody element and is normal'ly maintained repressed through the action ofa tensioned element, as a spring 7 disposed within the barrel 9 of thebody element. The spring 7' rests directly upon the head 8015 the valvestemG. A guide head 12 is threadedly disposed within the top of thebarrel 9. An actuating stem 10 outwardly extends centrally through theguide head 12 and has a head 11 disposed upon its lower end againstwhich the upperend of the compressible element rests. Bosses l3 and 14upwardly extend from the guide head 12 and a journal pin 15 is disposedthrough the upper portion of the bosses. A hand actuating lever 16 isrotatably disposed about the journal pin 15 and a cam 17 terminates theinner, lower end of the actuating lever. The cam 17 is in directalignment with the upper end of S the stem 12 and rests upon the stem10. The movement of the lever determines the position of the Cam 17 uponthe stem 10 and the position of the cam upon the stem determines theamount of compression that is placed upon spring 7. A quadrant 18 isdisposed about the upper surface of one of the bosses.

'A hand actuator 20 is journaled upon the lever.- A pawl 19 is securedto the free end of the actuator 20 and rests upon the graduatedquadrant. The compression of the actuatoractuates the pawl into and outof engagement with the quadrant and locks the hand lever 16 relative tothe quadrant. A piston ring- 21 is disposed upon the lower end ofthevalve stem 6 and forms a close fitting connection between the stemand the cylinder 22. If pressure is developed Within the hydrauliccylinder, not here shown, the actuating fluid within the cylinder flowsthrough an outlet 23 of the pipe 2 and actuates the valve stem 6 againstthe compressible element 7 and thereby opens one or more of thedischarge ports 24. The number of the ports 24 that are closeddetermines the effective pressure to be developed within the hydrauliccylinder and as the pressure increases the compressible element 7 iscoinpressed and a larger number, of the portedv outlets are opened. Thepressure exerted by the compressible element 7 may be predetermined byactuating the stem 10 through the manipulation of the hand lever 16. Thepressure placed upon the compressible element 7 determines the amount ofeflective pressure that may be developed within the hydraulic eylinderbyindirectly regulating the number of ported outlets that are openedthrough the movement of thevalve stem 6. To facilitate the drilling orreconditioning of the ported outlets 24, I provide passageways 25 withinthe side walls of the body element that are in registering alignmentwith the ported outlets 24. A limited amount of leakage will pass thepiston ring 21 and in doing so the operating fluid may enter thecylinder 9. Such fluid as may enter the cylinder 9 will by-pass throughthe outlet 26 into the discharge pipe 3.

dVhile the form of mechanism herein shown and described is admirablyadapted to fulfill the objects primarily stated, it is to be understoodthat it is not intended to confine the invention to the one form ofembodiment herein shown and described, as it is susceptible ofembodiment in various forms, all coming within the scopev of the claimswhich follow.

WVhat I claim is:

1. A'device of the class described comprising a body element having anopening longitudinally therein said opening formin into a barrel nearthe top thereof, a plurality of horizontally disposed outletscommunicating with the lower portion of the opening, an outlet chamberdisposed in direct alignment with the outlet ports, an independentoutlet communicating with the barrel portion of the opening and with theoutlet chamber, a spring disposed within the barrel, a valve stemreciprocably disposed within the opening adapted to maintain the outletports closed, the head of said stem being adapted to hold the lower partof the spring, a valve stem reciprocably disposed through the top of thebarrel, the head of said valve stem being adapted to hold the upperpartofthe spring, said spring adapted to be maintained compressed andresist the longitudinal movement of the valve stems. and a handle havingcommunicating with the barrel portion of the opening and with the outletchamber, a spring disposed within the barrel, a valvestem reciprocablydisposed within the opening adapted to. maintain the outlet portsclosed, the head of said stem beingiadapted to hold the lower part ofthe spring, a valve stem reciprocably disposed through the top; of thebarrel, the head of said valve stem being adapted to hold the upper partof the spring, said spring. adapted to be maintained compressed andresist the longitudinal movement of the'valve stems, a handle having acam disposed on one of its ends in direct alignment with the outwardlyextending valve stem for regulating the compression of the spring, meansdisposed through the body elementin registerable alignment with thehorizontally disposed outlet ports to facilitate the reconditionin ofthe outlet ports.

' CL DE H. MILLER.

